James peeston



(No Model.)

J .PREST0N.

'PISTODL Patented May4 so, 1882.

ATTORNEYS.

' NTTED STATES PATENT OEEICE.

JAMES PRESTON, OF NEW YORK, N. Y., ASSIGNOR OF ONE-ljlALF TO S. A. BURNS AND C. A. COOKE, OFSAME PLAGE.

PlsToN.

SPECIFICATION forming part of Letters Patent No. 258,599, dated May 30, 1882.

Application filed August 2, 1881.

To all whom it may concern:

Beit known that I, JAMES PRESTON, of the city, county, and State of New York, have invented certain useful Improvemen ts in Pistons, of which the following is a specification.

The object of my invention is to facilitate adjusting the packing ot' a piston in such a manner that it will lit very closely in the cylinder.

The invention consists in a pistou formed of a valve-cage attached to the end of a rod and provided at its lower edge with an externalI beveled ange, and ci' a beveled rin g attached to afork at the lower end of a tube surrounding the rod, between which beveled iiange and beveledringthepackingisheld,whichis wound spirally around the valve-cage.

In the accompanying drawings, Figure lis a longitudinal sectional elevation of my improved piston and its rod. Fig. 2 is a plan view of the valve-cage. Fig. 3 is a longitudinal elevation of the same. Fig. 4 is a cross-sectional elevation of the'spirally-wound packing-ring.

This invention is an improvement on the piston for which Letters Patent No. 242,366 were issued to me on the 31st day of May, 1881.

A short cylindrical piece, A, is attached to a transverse bar, B, fastened to the lower end of the piston-rod O, and a bottom, D, with a central aperture, E, and forming an external annular ange, F, ofthe cylindrical part A, is attached to the lower end of the same, whereby a valve-cage containing a ball, G, or any othersuitable valve,isformed,this ballor valve Gr closing the apertureE of the bottom D when the piston is raised. A beveled ring, H, isattaehed to the ends of afork, J, fastened to the lower end of a tube, K, surrounding the rod U, and held on the same by nuts screwed on the upper threaded end of this rod C. A packingstrip, L, of rubber, leather, or other suitable material, the ends of which strip are beveled, is wound spirally around the cylindrical part A,

(No model.)

and is compressed between the beveled ring H and the beveled iange F, as shown in Fig. 1. By turning the tube K on the rod C from left to right, foriustance, the ring H and the flange F will be brought together, and the packingstrip will lbe compressed tirmly and will spread outward and fit very closely against the sides of the cylinder M. It the packing-strip fits too tightly, it can be loosened by turning the tube K in the inverse direction. The spirallywound packing-strip L tits very closely on the valve-cage and against the beveled ring H and the flan ge F.

.Having thus described my invention,1claim as new and desire to secure by Letters Patent- 1. In a piston, the combination, with avalvecage having a beveled flange and attached to a rod, of a beveledring attached to the lower end of a tube surrounding the rod, and of a packing-strip wound spirall y around the valvecage and held between the beveled flange and beveled rin g, substantially as herein shown and described, and for the purpose set forth.

2. In a piston,thecombinatio11,with the short cylinderA, fastened to a rod, C, by a transverse bar, B, of the apertured bottom D, forming a beveled flange F, of the beveled ring H, at- 7o tached to the fork J at the lower end ot' the tube K, andot' a packing-strip, L, wound spirally around the short cylinder A, substantially as herein shown and described, and for the purpose set forth.

3. The piston-rod C, constructed, substantially as herein shown and described, with a valve-.cage formed ofthe short cylinder A, the transverse bar B, and the apertured bottom D, with projecting beveled edges atits lower end, as and for the purpose set forth.

JAMES PRESTON.

Witnesses:

OSCAR F. GUNz, C. SEDGWIoK. 

